Google Map of Pair-O-Dice

The dice have been part of the squadron's [90th Fighter Squadron] heritage since World War I. However, the pair of dice was officially adopted on February 24, 1924. Captain William G. Schauffler created the dice emblem while at Ourches, France. The squadron could not pick an emblem until then because it had to see at least three months of combat. Whatever the dice came up, they always equaled seven. Captain Schauffler thought this was appropriate because it symbolized the good fortune of the 90th Aero Squadron which lost very few casualties and only one aircraft.
-http://www.globalsecurity.org/military/agency/usaf/90fs.htm